cbcvebase.
CVE-2024-42102
published 2024-07-30

CVE-2024-42102: In the Linux kernel, the following vulnerability has been resolved: Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" Patch series…

PriorityP417medium4.7CVSS 3.1
AVLACHPRLUINSUCNINAH
EPSS
0.26%
17.3th percentile
In the Linux kernel, the following vulnerability has been resolved: Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" Patch series "mm: Avoid possible overflows in dirty throttling". Dirty throttling logic assumes dirty limits in page units fit into 32-bits. This patch series makes sure this is true (see patch 2/2 for more details). This patch (of 2): This reverts commit 9319b647902cbd5cc884ac08a8a6d54ce111fc78. The commit is broken in several ways. Firstly, the removed (u64) cast from the multiplication will introduce a multiplication overflow on 32-bit archs if wb_thresh * bg_thresh >= 1<<32 (which is actually common - the default settings with 4GB of RAM will trigger this). Secondly, the div64_u64() is unnecessarily expensive on 32-bit archs. We have div64_ul() in case we want to be safe & cheap. Thirdly, if dirty thresholds are larger than 1<<32 pages, then dirty balancing is going to blow up in many other spectacular ways anyway so trying to fix one possible overflow is just moot.

Affected

41 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.98-1 (bookworm)linux 6.1.98-1 (bookworm)
debianlinux-6.1< linux 6.1.98-1 (bookworm)linux 6.1.98-1 (bookworm)
linuxlinux
linuxlinux
linuxlinux>= 16b1025eaa8fc223ab4273ece20d1c3a4211a95d < cbbe17a324437c0ff99881a3ee453da45b228a00cbbe17a324437c0ff99881a3ee453da45b228a00
linuxlinux>= 1f12e4b3284d6c863f272eb2de0d4248ed211cf4 < 23a28f5f3f6ca1e4184bd0e9631cd0944cf1c80723a28f5f3f6ca1e4184bd0e9631cd0944cf1c807
linuxlinux>= 4.19.307 < 4.19.3184.19.318
linuxlinux>= 5.10.210 < 5.10.2225.10.222
linuxlinux>= 5.15.149 < 5.15.1635.15.163
linuxlinux>= 5.4.269 < 5.4.2805.4.280
linuxlinux>= 5099871b370335809c0fd1abad74d9c7c205d43f < 2820005edae13b140f2d54267d1bd6bb23915f592820005edae13b140f2d54267d1bd6bb23915f59
linuxlinux>= 6.1.79 < 6.1.986.1.98
linuxlinux>= 6.6.18 < 6.6.396.6.39
linuxlinux>= 6.7.6 < 6.86.8
linuxlinux>= 81e7d2530d458548b90a5c5e76b77ad5e5d1c0df < 145faa3d03688cbb7bbaaecbd84c01539852942c145faa3d03688cbb7bbaaecbd84c01539852942c
linuxlinux>= 9319b647902cbd5cc884ac08a8a6d54ce111fc78 < 000099d71648504fb9c7a4616f92c2b70c3e44ec000099d71648504fb9c7a4616f92c2b70c3e44ec
linuxlinux>= 9319b647902cbd5cc884ac08a8a6d54ce111fc78 < 30139c702048f1097342a31302cbd3d478f50c6330139c702048f1097342a31302cbd3d478f50c63
linuxlinux>= c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e < 253f9ea7e8e53a5176bd80ceb174907b10724c1a253f9ea7e8e53a5176bd80ceb174907b10724c1a
linuxlinux>= ec18ec230301583395576915d274b407743d8f6c < f6620df12cb6bdcad671d269debbb23573502f9df6620df12cb6bdcad671d269debbb23573502f9d
linuxlinux_kernel>= 0 < 5.10.223-15.10.223-1
linuxlinux_kernel>= 0 < 6.1.98-16.1.98-1
linuxlinux_kernel>= 0 < 6.9.9-16.9.9-1
linuxlinux_kernel>= 0 < 6.9.9-16.9.9-1
linuxlinux_kernel>= 0 < 5.4.0-195.2155.4.0-195.215
linuxlinux_kernel>= 0 < 5.15.0-121.1315.15.0-121.131

CVSS provenance

nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
osv7.8HIGH
vendor_ubuntu7.8HIGH
vendor_debian4.7MEDIUM
vendor_msrc4.7MEDIUM
vendor_redhat4.7MEDIUM
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